Objective:To evaluate the effect of HRCT in diagnosis of the sacroiliac joint of ankylosing spondylitis(AS).Methods:HRCT scanning of sacroiliac joints were performed in 86 adult patients with AS.CT findings were reviewed.Rank test was used for statistical analysis of the grade of sacroiliac joint changes in two groups based on course of disease and the sex of patients.Results:The CT findings of the sacroiliac joint changes in AS included erosion,arthrosclerosis,change of joint space,arthrokleisis,gas and soft tissue in articular cavity.Pathologic changes were more obvious with the course of disease prolonged (P0.01).In the group during the same course,pathologic changes were more marked in female patients than those in male ones(P0.01).Conclusion:HRCT can show tiny structures of sacroitiac joint clearly.This is beneficial to recognize different patologic changes and make correct diagnosis.

Objective To solve the signal interference problem by simulation algorithm when clutter signal can bring interference to radar life detecting system and reduce accuracy of its detecting. Methods According to some theory, automatic cancellation model was built up in computer with Matlab software. Results Simulation experiment shows that the cancellation composed signal So(t) is not correlative with the time and precision of auto-counteract but the amplitude and phase of clutter signal. Conclusion The results of the experiment have instructive significance about design of auto-counteract circuit.

Objective To design a circuitry for the indication of the remaining capacity of battery.The circuitry can remind the user of charging in time for normal operation of instruments and prevention of early invalidation due to the over-discharge of battery.Methods The circuitry was designed totally based on hardware which used general electronic components.Results The circuitry functions was dependable and reliable with accurate indication in radar based non-contact life detecting devices.Conclusion The whole design is simple and needs no programming technology.The PCB is small,and the debugging is simple.Moreover,it can be applied to indication of various capacity and voltage.

It is the measurement of high-loss dielectric to measure the permittivity and conductivity of biologic tissue.But now it is difficult to measure them accurately.Good result is got by measuring complex permittivity of phantom model at2450MHz using perturbation method,which is meaningful for the research on biologic tissue simulation by phantom model.

This paper introduces the means and characteristics of signal acquisition of the non-contact life parameters detection system as well as the design of preprocessor circuit.The results show that the preprocessor is designed reasonably,which can provide the computer with high quality signals.

It is a kind of precise method tomeasure the complex permittivities of the phantom model by vector network analyzer.But it is difficult tomeasure them accurately because the phantom model is jelly-like gel and is hard tobe shaped.Network decompositon method can be used toresolve it and it has great meaning tostudy the phantom model simulating the biologic tissue.

The definition, principle, characteristics of micropower Ultra-Wide-Band (UWB) radar are described and discussed in this paper. The human subject is experimented using the UWB radar developed by our team. The experimental results show that UWB radar is able to detect the life signals of the human subject such as respiration and heartbeat without any sensor and electrode touching the subject.The radar can be applied to non-invasive detection of life signals.

This article refers to constructing process of non-contact life parameter detecting system by twin-antenna. The technology above proves feasible through pilot study of restraining environmental interference by donkey antenna. A new method for solving the problem of environmental interference of non-contact life parameter detecting system is also presented.

This paper introduces the design of a linear photoelectric isolating amplifier circuit, and analyzes the errors of the circuit in experiment. The problem of narrow dynamic range in low power isolating circuit is solved.

This article refers to design of signal preprocessing software in the non-contact life parameters detection system,gives details about the composing of software and actualization method of every part,and lists correlative parameters and results.The experiments show that the parameters of this software accord with designed requirements.The software can make high quality signals available for display and process.